464 



sisi'i'.MA'ric i'\i.i';()N roi.od^ 



^iil is lohiihitcd and no two specimens are identical in contoni', nninher ol' 

 clianihers, etc. ; all sliowini;- nun'c or less \ ai'ial ion as in '/'rinirdi iiHiki ra ri- 

 al li lis. 



I )"( )i'l)ii;ii\' I'ccoi'ds jhe Torn! I'l'oni llie \'ienna Miocene; Seiiiieii/.a. 

 I'arker and Jones inenlion \\. from (lie later Terl iaries ol' ltal\' and 

 Sicily, and it is known in Hie P]ni;lisli ('i'a,L;- and the Tost Tertiai'v of 

 Noi'way as well as in many otiiei' localities of 'rertiarv a^^'c. 



II is commonest in depths ol' less than '•<> fathom^ at Hie present time 

 and is not conlined to any zone. 



(h-riirrcncr.- ('\\i)\"v\\w l*'<)i!i\i Ai'iox. Jones Wliarf. ( 'ai>\1';i;'I' 1*\)u- 

 MATION. ("liesapeake I^eacli. 



( 'oil eel ion. — Maryland ( Jeolo^ical Survey. 



('.(.■luis •IKUNCATllllNA d'Orliigny. 



The i;eiiiis '/'niinii I III i lid lliids its typical representation in llie species 

 7'. lohiilii/ii in which the superior siiid'acc is llal or nearly so and all the 

 seii'iiients ai'e xisihle, while the inferior surface is somewhat \aulted and 

 the form is so in\oliite that oiil\' the last clianihers of the llnal comolii- 

 ii(m heconie apparent. 'I'lic anionnt of \aultin!j,' and even the Hat superior 

 surface is siihject to coiisiderahle variation and in Triiiicul ii/iiid riiridhihs 

 no t \\(i specimens are alike. 



I'nder the ui'oiip of I'ldiiorhiil iiiir forms heloii^ a lai'p' niiinher of 

 species (lesci'ihed under (he iiaines of I'/diiorhiiliiid . A iioiiidliiiii . h'n'idhiid . 

 Uoldlid. etc. It is one of the niosf ahiindant of all livinj;' species and is 

 eomnion in fossil deposits of later ;4»'olo<;ic ap' tliou<>'h its oarliesl ap- 

 pearance is in rocks of ( 'ai'honi fei'ons a;;'c. 



''I'ltliNCA'lMiMNA l.oBA'l'i'KA (W'alker and Jacol)). 

 Plate (^\'.\.\l, Ki.ii-. ;, S. 



Noiifihia h,l>iilith(^ \Vlln^(•|■ niid .(jicoh, 1 i'.tS ijiih- Kiiiiiiinclicr's K,(l.), Adniii's Essays 



MiciDsc., p. (i4:i, |il. \iv, lit;-. HCi. 

 Trininitiilniii lohnliiln Hriidy, ISSI, CIimI. licpl., vol. i\, p. CCO, 1>1. veil, lit;'. 10; pi. 



.\ciii, \\\r». I, 4, T) ; pi. cw, lii;s. 1, "i. 

 Tninriiriin)i,( lobiit,d,i Miiuu', IS'.tS, Hull. Aincr. I';il., No. 10, p. :!.">. 

 Tniiiriihdiini l„h,did„ Hiiui;-, r.KU, M(l. (icol. Survey, Koceiic, p. ;ir>;i, pi. Ixiv, (ii;-. :\. 



Dcsiri /)l ion.- Test plano-coincx. inoderatelv \aiilled, last volution con- 

 sisting;- of seven, cin'lit, (U' nine chamhers with slightly depressed septa; 



